<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
    <meta charset="UTF-8">
    <title>三角形</title>
    <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport">
    <link rel="stylesheet" href="图形/triangle.css">
</head>
<body>
<div class="box"></div>
</body>
</html>
